Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and external-data behavior are covered structurally. The description confirms the external source ("public security advisories"), which is mildly additive, but it says nothing about latency, rate limits, advisory-source coverage, or what a caller gets back when no advisories match.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence with zero redundant wording. For a three-parameter read-only lookup, this is appropriately sized and every word carries meaning.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool is simple, annotations cover the safety profile, and the input schema is fully documented, so the description is close to sufficient. The notable gap is the absence of an output schema combined with no statement of the return shape — whether it returns a boolean, a severity level, or a list of advisories — which an agent would want to know before calling.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so all three parameters are already documented with examples, including the required exact-version format. The description reinforces "exact" but adds no syntax, normalization, or ecosystem-matching guidance beyond the schema, so baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb ("Checks") and resource ("one exact package version") against a named data source ("public security advisories"). The singular "one exact package version" implicitly distinguishes it from the sibling check_packages, but it never names or explains that contrast explicitly.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The phrase "one exact package version" hints that this is the single-package path and the sibling handles multiple, but no when-to-use, when-not-to-use, or alternative is stated. An agent must infer the routing rule from the singular/plural naming alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.